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#2. Katy Perry

Image via Getty/Paul Drinkwater/NBC

Why we loved her in 2010: Not only did she boost Cali's dwindling economy with increased tourism after "California Gurls" dropped, but she single-handedly encapsulated (and triggered) puberty with her second single "Teenage Dream." Then, realizing her audience was in an erotic trance, she put out the inspirational "Firework" to get us off YouTube and change the world. Fortunately, and most memorably, all of these singles (and mixed emotions) can be yours in her cotton candy-scented packaged album Teenage Dream that you need to scratch an image of her naked body on a cloud to smell.